/* =========================================================================
   Airport Status — Dark Theme
   ========================================================================= */

:root {
  /* Color palette */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-glow: rgba(255, 255, 255, 0.1);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Status colors */
  --closed-bg: rgba(239, 68, 68, 0.12);
  --closed-border: rgba(239, 68, 68, 0.3);
  --closed-text: #fca5a5;
  --closed-accent: #ef4444;

  --atrisk-bg: rgba(245, 158, 11, 0.12);
  --atrisk-border: rgba(245, 158, 11, 0.3);
  --atrisk-text: #fcd34d;
  --atrisk-accent: #f59e0b;

  --caution-bg: rgba(234, 179, 8, 0.12);
  --caution-border: rgba(234, 179, 8, 0.3);
  --caution-text: #fef08a;
  --caution-accent: #eab308;

  --delayed-bg: rgba(251, 146, 60, 0.12);
  --delayed-border: rgba(251, 146, 60, 0.3);
  --delayed-text: #fdba74;
  --delayed-accent: #fb923c;

  --operational-bg: rgba(34, 197, 94, 0.12);
  --operational-border: rgba(34, 197, 94, 0.3);
  --operational-text: #86efac;
  --operational-accent: #22c55e;

  --unknown-bg: rgba(148, 163, 184, 0.12);
  --unknown-border: rgba(148, 163, 184, 0.3);
  --unknown-text: #cbd5e1;
  --unknown-accent: #94a3b8;

  /* Fonts */
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Spacing */
  --container-max: 1200px;
  --gap: 16px;
}

/* ---- Reset & Base ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--delayed-accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* ---- Header ---- */
#header {
  background: linear-gradient(
    135deg,
    rgba(15, 23, 42, 0.95) 0%,
    rgba(30, 41, 59, 0.9) 100%
  );
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

h1 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 2px;
}

.last-updated {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
}

.update-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--operational-accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

/* ---- Summary Stats ---- */
.summary {
  max-width: var(--container-max);
  margin: 24px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--gap);
}

.stat-card {
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
  transition:
    transform 0.2s ease,
    border-color 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.stat-closed {
  background: var(--closed-bg);
  border-color: var(--closed-border);
}
.stat-closed .stat-number {
  color: var(--closed-accent);
}
.stat-closed .stat-label {
  color: var(--closed-text);
}

.stat-at-risk {
  background: var(--atrisk-bg);
  border-color: var(--atrisk-border);
}
.stat-at-risk .stat-number {
  color: var(--atrisk-accent);
}
.stat-at-risk .stat-label {
  color: var(--atrisk-text);
}

.stat-caution {
  background: var(--caution-bg);
  border-color: var(--caution-border);
}
.stat-caution .stat-number {
  color: var(--caution-accent);
}
.stat-caution .stat-label {
  color: var(--caution-text);
}

.stat-delayed {
  background: var(--delayed-bg);
  border-color: var(--delayed-border);
}
.stat-delayed .stat-number {
  color: var(--delayed-accent);
}
.stat-delayed .stat-label {
  color: var(--delayed-text);
}

.stat-operational {
  background: var(--operational-bg);
  border-color: var(--operational-border);
}
.stat-operational .stat-number {
  color: var(--operational-accent);
}
.stat-operational .stat-label {
  color: var(--operational-text);
}

.stat-total {
  background: var(--unknown-bg);
  border-color: var(--unknown-border);
}
.stat-total .stat-number {
  color: var(--text-primary);
}
.stat-total .stat-label {
  color: var(--text-secondary);
}

/* ---- Filters ---- */
.filters {
  max-width: var(--container-max);
  margin: 24px auto 0;
  padding: 0 24px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-glow);
  color: var(--text-primary);
}

.filter-btn.active {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.4);
  color: #a5b4fc;
}

/* ---- Airport Grid ---- */
.airport-grid {
  max-width: var(--container-max);
  margin: 24px auto 0;
  padding: 0 24px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--gap);
}

/* ---- Airport Card ---- */
.airport-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 20px;
  backdrop-filter: blur(10px);
  transition: all 0.25s ease;
  animation: fadeIn 0.4s ease forwards;
  opacity: 0;
}

.airport-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.card-airport-info {
  flex: 1;
  min-width: 0;
}

.card-icao {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.card-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2px;
  line-height: 1.3;
}

.card-location {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Status badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 5px 12px;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
}

.status-closed {
  background: var(--closed-bg);
  color: var(--closed-text);
  border: 1px solid var(--closed-border);
  animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.3);
  }
  50% {
    box-shadow: 0 0 12px 2px rgba(239, 68, 68, 0.15);
  }
}

.status-at-risk {
  background: var(--atrisk-bg);
  color: var(--atrisk-text);
  border: 1px solid var(--atrisk-border);
}

.status-caution {
  background: var(--caution-bg);
  color: var(--caution-text);
  border: 1px solid var(--caution-border);
}

.status-delayed {
  background: var(--delayed-bg);
  color: var(--delayed-text);
  border: 1px solid var(--delayed-border);
}

.status-operational {
  background: var(--operational-bg);
  color: var(--operational-text);
  border: 1px solid var(--operational-border);
}

.status-unknown {
  background: var(--unknown-bg);
  color: var(--unknown-text);
  border: 1px solid var(--unknown-border);
}

/* Delay details */
.delay-details {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

.delay-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 4px 0;
}

.delay-type {
  font-weight: 600;
  color: var(--text-primary);
  text-transform: capitalize;
}

.delay-reason {
  color: var(--text-muted);
  font-style: italic;
}

/* Card border glow for closed airports */
.airport-card.card-closed {
  border-color: var(--closed-border);
  box-shadow: inset 0 0 0 1px rgba(239, 68, 68, 0.05);
}

.airport-card.card-at-risk {
  border-color: var(--atrisk-border);
}

.airport-card.card-caution {
  border-color: var(--caution-border);
}

.airport-card.card-delayed {
  border-color: var(--delayed-border);
}

/* ---- Country group header ---- */
.country-header {
  grid-column: 1 / -1;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 16px 0 4px;
  border-bottom: 1px solid var(--border-subtle);
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.country-header .country-flag {
  font-size: 1.3rem;
}

/* ---- Loading ---- */
.loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--delayed-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---- Error banner ---- */
.error-banner {
  max-width: var(--container-max);
  margin: 16px auto;
  padding: 12px 24px;
  background: var(--closed-bg);
  border: 1px solid var(--closed-border);
  border-radius: 10px;
  color: var(--closed-text);
  text-align: center;
  font-size: 0.9rem;
}

.error-banner.hidden {
  display: none;
}

/* ---- Footer ---- */
footer {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 24px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
}

/* ---- No results ---- */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .summary {
    grid-template-columns: repeat(3, 1fr);
  }

  .airport-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.2rem;
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .stat-number {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .summary {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .stat-card {
    padding: 14px;
  }
  .stat-number {
    font-size: 1.4rem;
  }

  .filters {
    gap: 6px;
  }
  .filter-btn {
    padding: 6px 14px;
    font-size: 0.8rem;
  }
}